Aircraft-propeller.



F. H. ROYCE. MRCRAFT PROPELLER. APPLICAIION man SEPT. 19, 1916.

Patented Apr. 17, 1917.

[nyentvr C 5 r W n H m a F UNITED STATESPATENT on ncn.

FREDERICK HENRY ROYCE, on DERBY, ENGLAND, ASSIGNOE T0 noLLs ROYCE LIMITED,

or DERBY, ENGLAND.

AIRCRAFT-PBOPELLER.

Specification of Letters Patent Patented Apr. 17, 1917,

Application filed September 19, 1916. Serial No. 121,072.

To all whom it may concern:

i Be it known that I, Fnnonnrci'c HENRY ROYCE, a subject of the King of England, residing at Derby, in England, engineer, have invented certain new and useful -Improvements Relating to Aircraft-Propellers, of which the following is a specification.

This invention relates to aircraft propellers and consists of improved means for mountingsaid propellers (which are usually constructed of Wood) on the hubs which are adapted to be mounted on the driving shafts, and it has for itsohject to relieve the bolts, by 'Which the bos'spf the propeller is fixed and secured to the hub, from any bending moment due to the driving stress.

According to the present invention, the

.hub-comprises a sleeve having two. flanges one of which is integral therewith and the .to secure by other one detachably mounted on said sleeve and securedagainst relative rotary motion thereto by means of splines or serrations. The said detachable flange is also prevents ed from rocking in a plane perpendicular to the axis of the sleeve by means whichv may comprisev a split externally coned ring mounted on the-sleeve and forced into an internally coned portion of the boss of the flange by a nut screwed on to the butsideof said boss so that said ring operates tolock the detachable flange to the sleeve by a wedging action. i

. In the accompanyingdrawing which illustrates this invention, the figure is a half sectional elevation, the boss of the propeller being omitted. for the sake of clearness The sleeve a'constituting the hub has one flange a formed integrally therewith. The other flange a is detachably mounted on the sleeve (1 and is provided with serrations 0 in the'bore of one end of its boss, these serrations engaging v corresponding serrations a on-the exterior ,of the sleeve so that al-,

' though the flange may slide endwise' in relation to the sleeve to accommodate small differences inlthe thicknesses of the propeller boss it can have no rotary movement independently of said sleeve. The detachable flange c is secured in the desired position relatively to the flange a and the propeller is prevented from rocking in a plane perpendicular to the axisof the hub, by forming an internal cone 0 at the outer end of the boss of said flange c and forcing a split or divided coned ring f, loosely mounted on the sleeve, into close engagement with said internal cone 0 said ring f being operated and locked by means of a nut e which is screwed on to threads 0 formed on the exterior of the boss and is provided with a flange c which engages a recess 0 in'the coned ring f. I

By this means the drive is transmitted from hubjto propeller equally at each end and puts no stress on the securing bolts (Z other than a shearing stress.

The complete hub is mounted on the driving shaft 5 in any suitable manner and the drive is preferably communicated by the engagement of serrations a on the sleeve 0 With-serrations b on the shaft.

What I claim as my invention and desire Letters Patent of the United States is 1. An air-craft-propeller hub-comprising a 'sleeve'having exterior longitudinal serrations, a flange integral with said sleeve, a second flange spaced therefrom and having a boss interiorly serrated to engage the serratlons on the sleeve, an' nterior coned surface on said flange bow-an exteriorly coned ring loosely mounted on the sleeve and adapted to engage said interior coned surface and a nut screwed onto the boss and adapted to force and hold the coned ring in such engagement. v

2. An air-craft propeller hub comprising a sleeve, a flange integral therewith a-detachable flange mounted on the sleeve splines or equivalents adapted to prevent rotary motion of the flange on the sleeve and means for locking said detachable flange on the sleeve and preventing it from rocking in a plane perpendicular to the axis thereof said means comprising a split externally coned ring mounted on the sleeve, an interiorly coned portion on the flange adapted to receive said ring and a nut screwed onto the flange and engaging said ring.

In witness whereof I have signed this specification in "{the presence of two witnesses.

FREDERICK HENRY ROYCE. Witnesses:

I ALBERT GEORGE ELLIOTT,

SARAH MABEL WOLVERSON. 

